Meanwhile, this nanocomposite expedited oxygen production because of its catalase activity, further strengthening the PDT efficacy of loaded ICG.[113] The highly active (102) surface of biodegradable CuS nanoparticles (containing Cu+) was exemplified to be easily degraded by pH and laser irradiation at 808 nm, which released large amounts of Cu+ for producing sufficient ROS by laser‐enhanced catalytic Fenton‐like chemical reaction with desirable tumor‐therapeutic consequence.[114]. This evidence concerns the gene CAT and neoplasm.